Ok, I think we're done. If you view this subject as a "doctrine" then you've made it way more important then is justified. I'll not discuss it with you further.
Well of course it is a doctrine:
“A belief or set of beliefs held and taught by a church, political party, or other group: the doctrine of predestination”
http://www.oxforddictionaries.com/us/definition/american_english/doctrine
It’s a set of beliefs that is held and taught by various churches and groups within Protestantism.